Drill



Opt. 19, 1937. w. L. PEARCE 2,0 ,13

DRILL Filed Dec. 16, 1935 2 Sheets-Sheet 1 I I 74 I; 7

I l l I 6 6 awucwvbom Patented Oct. 19, 1937 UNITED STATES n roses;

PATENT m DRILL William L. Pearce, Houston, Tex.

.Application December 16, 1935, Serial No. 54,699

10 Claims.

An object of the invention is to provide a drill having a novel type of cutter on the lower end of the body and which is readily replaceable when worn out so that the body of the drill may be reused from time to time.

Another object of the invention is to provide a drill having a cutter thereon formed with oppositely directed blades which have longitudinal fins spaced apart on the forward faces thereof and which are provided with sharp cutting edges to effectively separate and break up the formation moving upwardly along the forward faces of the blade as drilling progresses; said fins also form channels for the drilling fluid which are effective to concentrate the drilling fluid against the formation on the forward faces of the blades 2 whereby said formation is swept oil" and theblades kept clean.

A further object is to provide a drill of the character described having an enlarged chamber at the lower end of the body for receiving the drilling fluid with outlet openings leading therefrom onto the forward faces of the blades, said chamber being provided with a deflector which will readily deflect the on-coming drilling fluid for a purpose tobe hereinafter stated.

With the above and other objects in view the invention has particular relation to certain novel features of construction, arrangement of parts and use, an example of which is given in this specification and illustrated in the accompanying drawings, wherein:

Figure 1 shows a side view of the drill, partly in section.

Figure 2 shows an edge view, partly in section.

Figure 3 shows a cross-sectional view taken on the line 3-3 of Figure 1.

Figure 4 shows a bottom end view of the drill, and

Figure 5 shows an upper end view of the cutter shown detached.

Referring now more particularly to the drawings wherein like numerals of reference designate similar parts in each of the figures, the numeral I designates the head of the drill which has the threaded shank 2 for the connection of the drill to the driving stem. Depending from the'drill head there is the widened drill body 3 which is approximately rectangular in cross-sectional contour, said head, shank, and body being previously formed integrally together. There is an axial channel 4 leading downwardly through the shank, head, and body, for conducting the drilling fluid. I

The numeral 5 designates the cutter whose lower end is preferably formed. with oppositely directed cutting blades 6, 6. The cutter 5 is pref-= erably welded to the lower end of the body and when the cutter is worn out, the worn cutter may be detached in any approved manner as by a cutting torch and a new cutter welded to the, lower end of the body so that the head, shank, and body may be reused from time to time.

The forward face of each blade has the longitudinal fins, as I, la, suitably spaced apart to provide longitudinal channels between them.

The upper end of the cutter 5 is formed with a transverse cavity 8 forming an enclosed chamber when the cutter is welded to the body, intowhich'the drilling fluid is discharged into the channel 4.

Discharge ports 9 lead downwardly from the chamber and are provided to discharge the drilling fluid onto the forward faces of the blades between the fins, one of said ports also discharging the fluid downwardly along the inner side of the inner fin 1. i

There is a transverse deflector I0 across the chamber 8 and aligned underneath the discharge end of the channel 4, said deflector tapering upwardly to a transverse apex.

In drilling through sticky formation such as gumbo, the formation will pass upwardly along the forward faces of the blades and has a tendency to adhere to the blades. This formation will be divided or broken up by the fins 1, 1a and partially separated from the faces of the blades and the drilling fluid being forced under strong pressure down along the said channels and over the forward faces of the blades will pass under neath thecformation adhering to the blades and wash it off of said faces to keep the blades rela-' tively clean and free of the formation, thus conducing to a more rapid progress of the drill through the formation at the bottom of the bore.

The drawings and description disclose what is now considered tobe a preferred form of the invention by way of illustration only while the broad principle of the invention will be defined by the appended claims. a

What I claim is:

1. A drill comprising a drill body having an axial channel therethrough, a cutter secured to blades, longitudinalfins spaced apart on the forward faces of the blades, said chamber having T the fins. l

'2. A drill rcomprising outlet ports leading into the channels between "axial channel'therethrough, a cutter secured to the lower end of the bodyhaving a" chamber therein' and formed with-oppositely directe d cutting blades, longitudinal fins spacedapart on the forward'faces of the blades, said chamber having outlet ports leading'into the channelsbetween the finsfand ia'deflector across the chambergunden;

' neath' 's aid 'axia'l channel. 7 7

3.:Adrill comprising a headhavinga threaded shank'and a flat body depending from the head;

a cutter secured to the lower endof theheadf formed with an internal chamber, said drill hav' l ingran axial; channel leadin'g'from the upper'end' I thereof and termiinatingin the'chambfer, the cutter being formed with cutting blades; longitudinal fins 'on the forward faces of the blades spaced apart to provide" channels between them; said cutterihaving. outlet ports leading fromrthe chamberjthrough'which the drilling fluid maybe dis;

charged oven-the forward faces of the blades and through said blade-channels,

7 4rA'drill comprisinga head havingiagthreadd shank and a1 fiat body :dependingfro'm the head, 1 a cutter secured i tothe lower end} of the head formed with an" internal chamber; saiddrill'hav-j ing an axial channel leading from the upper end 7 thereof and terminatinginthe' chamber, the cut- 1 [ter heing'formedwith cutting blades, longitudinal ffins fon thefQ 'Wa-rd faces 'of the blades spaced apart to provide channel's between them, said fc'utter having-outlet ports leading from the cham her through" which the drilling fluid may beldis- .charged over the-forwardfaces of the blades'and'. fthrough said; iblade channels,.a transverse dej r fiector acrossthe-chamber underneath saidaxial" 7 channel which tapers upwardly to an apex. v 5, A drill having-a body and a cutter welded} to the;lower endof the body, the uppenend-oi .tne' cutter having a' transverse chamber therein and the drill having an axial channel :leading from itsupper end and terminating in said cham- 4 bar, longitudinal outstanding fins on the forward races or the cuttersgand spaced apart to'provide drill having an channels between them, saidchamber having outlet ports through which the'drilling fluid is directed into the upper ends of the channels. I 6. A drill having a body a'n'da cutter welded to' 'the lower end of the body; the upper end: of; ,Zthe cutter having a transverse chamber therein and the drill having an axial channel leading from its upper end and terminatingin said chamber, longitudinal outstandingfins on the Iorward 'faces .of the cutters, and spacedgapart rtq 'provide channels 7; between-"1 them, said chamber, having j a outlet: portsihrough whicnthe'drillingfluid is the chamberaligned underneath the lower end of saidfiaxial channel. V

V 7. A drill comprising a] drill body, a cutter secured to the lower end of thebody and formed with oppositely directed blades, longitudinal fins spacedapart on the'forward faces of therblades. v ;8. ;A drill?comprisingfaidrillj body, ajcutterfs'e- 1 i cured ,tothelower end or the body landrformed with oppositely directed blades; longitudinalfins" spaced apart on' the forward faces of the iblades, said drill'having a channel terminating inports' between-the V through which 7 a flushing fluid maylxbeisupplied to the blades; I

9,7 A'drill having a midi; stparaeac 'titgf means welded to thelowerj end of the body, said drill havingga transverse chamber and having an --dir.ected into the upper ends ofthe channels, and r 7 l V atransverse upwardly. tapering deflector across,

25 l a I axiallfchannel leading iromits upperfendintb said'gchamber, Flo'ngitudinal outstanding finskon the cutting-means and spaced apart to-provide 7 channels-between them, said"chamber having ioutlet ports through which'drllling fluid may 'be 7 directed-into "therchannels'. J

V ;1-0.- A; drill' having a body, separate flitting? a means welded to'the, lowerendof the body, said drill having a chamber and having an axial Chanlnel leading-from itslupjperf end into the chamber,

outstanding fins cn'the cutting means-spaced apart to provide channelsf which lead "downwardly. to'the-lower end of'the drill, said chamber haying" outlet ports through which drilling may be, directed iinto? said;channels.

V -V :WILLIAMVL. PEARCE.

so I 

